I have a class with number of private data members (some of them static), accessed by virtual and non-virtual member functions. There's no inline functions and no friend classes.

class A
{
    int number;
    string str;
    static const int static_const_number;

public:
    // got virtual and non-virtual functions, working with these memebers
    virtual void func1();
    void func2();

    // no inline functions or friends
};

Does changing the order of private data members breaks ABI in this case?

class A
{
    string str;
    static const int static_const_number;

    int number; // <--   integer member moved here
    ...
};